Originally Posted by Darren
I understand your comment regarding the email, however, it's a Peruvian airline with a ticket flying from one Peruvian destination to another Peruvian destination. Other than a few tourists here and there, it's a safe bet that the ticket holder is going to speak Spanish.
When I flew LIM-CUZ-AQP-JUL-AQP-LIM on LAN Peru, most of the passengers were tourists (usually American, British or German) visiting Cuzco or Lake Titicaca.